[tunesmith]

Subcontracting could get you part of the way there. If we assume you keep your full-time job and have a restricted number of extra hours to devote, you could probably handle a mid-size project where you're managing/overseeing/architecting while subcontracting to 1-2 other developers that you trust. Depending on your margin, you could hit that range. I'd recommend sticking to local developers in your circle that you can work well with, as opposed to off-shoring, which has a higher margin but a higher probability of backfiring. It'd work well for your skillset since a lot of freelance developers don't tend to market themselves aggressively, and are happy to be subcontracted to.

I did this for a few of my own freelance projects - it worked ok, although I also found that as a solo freelancer, the clients that were interested in hiring me tended to have budget restrictions that made them nervous to commit to sums of money that necessitated subcontractors. So it was an occasional thing for me.